LG FLATRON L1520B - Page 14

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2. NO RASTER (OSD IS NOT DISPLAYED) – LIPS
CHECK MICOM INV
ON/OFF PORT.
(U501 PIN9)
J707 PIN2
2.5V?
NO
NO RASTER
(OSD IS NOT DISPLAYED)
CHECK LIPS
J707
PIN5, PIN 6
5V?
NO
1. CONFIRM BRIGHTNESS
OSD CONTRL STATE.
2. CHECK MICOM DIM-ADJ
PORT(U501 PIN41)
J707 PIN1
5V?
NO
LIPS
CHECK
PULSE AS
CONTACTING SCOPE
PROBE TO CAUTION LABEL.
(CONTACT PROBE TO
CAUTION LABEL.
CAN YOU SEE PULSE
AT YOUR
SCOPE?
NO
REPLACE CCFL LAMP
IN THE LCD MODULE
YES
YES
YES
YES
3 4
Waveforms
J707-#2 J707-#2
1
3 4
Inverter Off
Micom Port check
J705 Inverter output
Inverter On
Micom Port check
J705 Inverter output
1
J707-#5, 6 / U801-#1/U803-#3